#1 genericize indexing process

[Tricia]

Reconfigure Martini so that it has the option to take
either a solr schema.xml as input or existing
definition in build file (or even force an xml as
input???) to build an index. Currently fields are
specified by parameters to Indexer in
newgenericbuild.xml ant build file. Schema should
specify all parameters needed in order to build a
Lucene document. Need to decide how content of defined
fields will be determined and ensure that it will be
inserted into the appropriate field.